Machine for setting fasteners



June 5. 1928.

Filed Aug. 8, 1927 m Y mW m R WM r Y B p Patented June 5, 1928.

nulrso "STATES PATENT] OFFICE.

MELLEN n. EBAY, or BOSTON, MASSACHUSETTS, ASSIGNOR T0 TUBULAR R ver & STUD COMPANY, OEBOSTON, MASSACHUSETTS, A CORPORATION on MASSACHUSETTS.

MACHINE non SETTING FASTENERS.

Application. filed August 8 1927. Serial No. 211,354.

This invention relates to machines for sett ng'tubular rivets and slmilar fasteners.

A common type of setting mechanism for fasteners of this character comprises a driver, an anvil against which the fastener use pilot pins of different lengths'in setting.

fasteners in work of different thicknesses,

and it is frequently necessary, therefore tochange pilot pins.

Furthermore, the springs which serve to project the pilot pins cause trouble by buckling or cramping. a i

' The present invention deals especiallywith these difiiculties and it'aims todevise a setting mechanism whichwill be readilyadaptable to a wider range'of work andwill be more reliable in operation than prior constructions. I

The natureof the invention will be. readily understood from the following descriptionwhen read in connection with the accompanying drawings, and the novel features will be particularly pointed'out inthe appended claims.

In the drawings, H

Figure 1 is a side view, partly in crosssection, showing those parts of a fastener inserting mechanism withwhich the present invention is more especially concerned, and illustrating also an anvilconstru'otion embodying this invention;

Fig. 2 is a view,partly in side elevation and partly in vertical cross-section, show ing the setting mechanism at substantially the completion of the fastener setting operation; and Y Fig. 3 is a vertical, cross-sectional view of an anvil of a slightly differentconstruction.

Referring first to Figs. 1 and 2, the mechanism there shown comprises a pair of springv pressed jaws 22, designed to receive and grip a rivet or other fastener F and hold it for the operation thereon of the driver 3. Fasteners are delivered one ata time the jaws 72-2 by an automatic masher including a raceway a, all of this usually being sleeve project-the pilot 14 of the anvil. projects is determined by the adjustment of the nuts 16'16 on the plunger 15.

construction being old and well known in this art. I

- Thev workW issupported for the fastener setting operation on an anvil 5 which is mounted in a work supporting arm dwith which the machine is equipped, this arm adjustable I vertically. -A 7 whichis threaded through the arm 6 so that it maybe adjusted verticallywith reference thereto, supportsthe anvil 5, and this sleeve is provided with an internal shoulderpiece' 8 'on which the anvil rests. Nuts are threaded onthe sleeve above and below the armfi. and one of these nuts 9 at the upper end of the sleeve is provided with a set screw 10, the inner end of which enters a. groove 12' in the anvil and holds it against upward movement.

The pilot pin 14, as shown in Figs. 1 and 2, is removably mounted in a plunger or shank 15, the lower part of which is screw threaded to receive adjustable'nuts 16; and p a strong coiled spring 17 encircles the lower part of the 'member 15and bears againstthe nuts 16, this spring being backed up by a cap nut18 which is threaded on to the lower end ofthe sleeve 7 It will be evident that'the spring 17 acts through the adjusting nuts 16 to urge the pilot pin plunger 15 upwardly andthus to above the upper surface The distance which the pilot Usually the parts are. so adjusted that the upper end of the pilot-pin will project very slightly abovethe uppersurface of the work. As the fastener F is forced downwardly by the driver 3 during the setting operation its lower' endstrikes on the upper end of-the pilot. pin :and thereafter the pilot pin descends with the fastener. The parts are so adjusted, however, that the lower end of the plunger '15 strikes the cap 18 when the tip of the pin 15 arrives in a position where it is flush with the cup 19 in the anvil 5, the

two parts 14 and 5 cooperating at this time to form a clinching cavity. Further downward movement of the pilot pin thus is stopped, and the fastener is clinched by the final movement of the driver. a V g It should be observed that the pilot pin can easily be adjusted to uit the require manta of different articles at was simply by plunger 15 and is backed 2, the pilot pin 14 normallybeing adjusting the nuts 1616 on the plunger 15. Also, that the pilot pin can readily be replaced whenever desired.

A slightly different embodiment of the invention is shown inFig. 3 in which the 'iarts similar to those shown in Figs. 1 and 2 are indicated by corresponding, but primed, numerals.

shoulder 8 in the sleeve 7. is made integral with the shank or plunger '15,- and this plunger is threaded to receive nuts 1616 which are arranged to engage an internal shoulder 20 formed on the anvil and thus limit the projectingmovement of the pin produced by the coiled spring 17. This spring encircles a portion of the The pilot pin 14:

threadeiil plug nut 18.

The operation of the construction shown in Fig. 3 is like that shown in Figs. 1 and projected by the spring 17 but beingdepressed during 21 corresponding to the cap "the driving of the fastener until its lower and strikes the plug 21.

The length of the plunger is such that this occurs whent'he tip of the pilot pin is flush with the clinching cup 19 in the anvil.v The clinching oi the rivetoccurs while the pin is-in this position.

In bot-h constructions cramping of the spring is prevented by the fact that it encircles the pilot pin shank or plunger. In both constructions also the pilot pins can adjusted vertically to accommodate work of different thicknesses. Interrupt ons in the operation of the machine due to cramped or buckled springs thus are avoided and the necessity for apilot pin for'each thickness In this construction the I anvil 5 is smaller and it simply rests on the iip by a screw ject through the end of said anvil, a coiled spring arranged to act on said plunger to ro 'ect said in and screw threaded means p l p a adjustable to limit the projecting movement of said pilot pin. .7

,2. In .a machine of the character described, the combination of an anvil, a plunger slidably mounted in said anvil, a pilot pin supported on said plunger and adapted to project through the end of said anvil, a coiled spring for moving said plunger to project said pin,'and a nut threaded on said plunger and cooperating with a part fixed with relation to the anvil to limit the pi'ojecting nove ment of said pilot pin.

3. In a machine of the character described,

the combination of an anvil, a plunger slidably mounted in said anvil, a. pilot pin supported on said plunger and adapted to pro-v ject through the end of said anvil, a nut threaded on said plungen a coiled ln'ing;

encircling said plunger and acting on said nut in a direct-ion to move the plunger to project said pin, and a part fixed with relation to the anvil for engaging said nut to limit said projecting movement.

4; In aniachine of the character described, the combination of an-anvil, a sleeve in which said anvil is mounted, one of said parts having an'internal shoulder, a pilot pin movably mounted in said anvil, a "plunger supporting said pilot pin, a coiled spring acting on said plunger to project said pilot pin, said plunger having a screw'threa ded exterior surface, and a nut threaded on the screw threaded portion of the plunger and arranged to engage said shoulder to limit the projecting movement of said pilot pin.

5. In a machine of t :e character describes,

the combination of an anvil, a pilot pin slidably mounted in said anvil and adapteldto project through the end of the anvil, a.

plunger supporting said pilotpin, a coiled spring acting on said plunger'to project said pilot pin,-and two-cooperating partsassociated respectively with said plunger and anvil for limiting the projecting movement of said pilot pin, one of said parts being adjustable to vary the position of the end of said pilot pin when projected.

MELLEN N. EBAY. 

